How Can I Efficiently Handle Multiple Cases in a C Switch Statement?

Handling Multiple Cases in a Switch Statement

In C , switch statements allow for the execution of specific code blocks based on the value of a variable. While it's possible to chain multiple case statements with the same result using explicit values:

switch (value) {
    case 1:
    case 2:
    case 3:
        // Do something
        break;
    case 4:
    case 5:
    case 6:
        // Do something different
        break;
    default:
        // Default stuff
        break;
}

The syntax you're thinking of, however, is not available in C . The ability to group case values with a comma-separated list, as seen in the following example:

switch (value) {
    case 1, 2, 3:
        // Do something
        break;
    case 4, 5, 6:
        // Do something different
        break;
    default:
        // Do the Default
        break;
}

... is not supported in the C language.

As an alternative, you can use a combination of case statements and the break keyword to achieve the same result in a syntactically more optimized manner:

switch (value) {
    case 1:
    case 2:
    case 3: 
        // Do something
        break;
    case 4:
    case 5:
    case 6: 
        // Do something different
        break;
    default:
        // Do something for other cases
        break;
}

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